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There seems to be no end to the benefits of fish oils. Not only are they said to boost heart, brain and joint health, but they also prevent cancer, eye disease and bone problems.

Last week, a new study suggested they could assist the body against premature ageing. But how do you separate the facts from the hype?

WHAT'S SO SPECIAL ABOUT FISH OILS?

Fish oils are a type of polyunsaturated fat - a 'healthy' fat. Unlike saturated animal fats, they don't raise your cholesterol levels, but are known to have a positive effect on health. Polyunsaturated fats are divided into two groups of what are called Essential Fatty Acids (or EFAs) - omega-3 and omega-6.

Both omegas are essential in helping to regulate blood clotting, body temperature, blood pressure and the immune system; they are also needed to make prostaglandins, important hormone-like chemicals in the body. The only way we can get them is through our diet.

Omega-3 has particular benefits, producing vital substances such as DHA (docosahexaenoic acid), thought to play a key role in the development of brain and cognitive function, and EPA ( eicosapentaenoic acid), vital for brain health.